Improvisational training teaches students the same principles that Meisner work does. Moreover, the major improv training programs are approximately a year and a half in duration, effectively halving the students' training commitment. Add to that the fact that improv training itself empowers the individual student to recognize when they're succeeding in an exercise as opposed to the instructor being the sole arbiter of success. Throw in the additional fact that audiences actually pay money to watch people improvise (show me anyone who would pay money to see people do Meisner exercises onstage and I will show you a total and complete nutbag with no social skills) and that improv training is crazy FUN and I think there's a strong argument for improvisational training over Meisner work.
On a personal note, I dislike Meisner in large part because I have had the experience that Meisner teachers are loud, disappointed actors who wear caftans and like to control their students. I hate caftans and the people who wear them.